I got a set of 24s for my Cobra that were blueprinted/balanced and then sent my old ones in for the core refund. The ones I got were OEM ones that someone else had sent in. That is the way to do it IMO, that way you aren't down a week waiting for shipping. I forget the site tho... If you have a situation like mine where you have a garage and a third vehicle that's a good option though.
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.